Do you have Fit for Real People? This book is a must have. I've been sewing for over 35 years and refer to it all the time. According to one of the fixes in FFRP, you could make a tuck across the back(as in Swayback adjustment)and this might bring the seam where it needs to be. You might also try bringing those shoulder seams forward a bit. Keep us posted on the progress.

I do have FFRP. I read most of it last night. I was thinking that I might have a high round back (although it's difficult to tell since there is no neck seam in the back) and was wondering if I did an adjustment for that if it would bring the side seam into place.

In RTW, my garments do tend to pool in the hollow of my back, so maybe I do need a swayback adjustment.

My main challenge is in making these adjustments to the muslin. FFRP illustrates the adjustments on a flat pattern, so I'm not sure where to pin. Although Gertie is beginning by having us alter the muslin and then transfer the alterations to the pattern, I'm thinking that I might start altering the pattern first and then make up a new muslin.

I encountered the forward shoulder problem on my friend while fitting his doublet and just grabbed a sharpie and marked up the mockup. Then I cut a triangular wedge to bring the seam to the shoulder point ("X" marks the spot on the first one) and it worked for him. There's also marks on the first mockup for narrow shoulders, a bit of a narrow chest, and a beer belly ...

Probably not the best way, but it did work.

------I don't really make mistakes ... I create "learning opportunities"! Murphy says: The better you match the thread to the fabric, the more likely you will need to rip some stitches out! I spend more quality time with my seamripper than I like ...
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Could we get a photo of you in a leotard or tight-fitting camisole? It's hard to tell what's going on in the back, but it looks like it's way too big all over. You might need a smaller size there. I know, you're already using size 0.

You have what P&P refer to as a forward neck (or head), I think, which explains part of what's happening with the shoulder line.

ETA: Actually, a side photo of the un-dressed tape dummy would do to let us know what your shape is back there. -- Edited on 12/13/10 3:29 PM --

------Ecclesiastes 11:7,8 Nothing on earth is more beautiful than the morning sun. Even if you live to a ripe old age, you should try to enjoy each day, because darkness will come and will last a long time. (CEV)

I agree with Debbie that you have a forward neck and a sway back. Fitting from the top down, fix the forward neck which is making the shoulder seam look like it's the problem. The shoulder seam appears to be too far back, but it's lined up over your arm. The side seam will probably move back with the sway back adjustment.

Last night, I put the muslin aside and started altering the pattern, using FFRP as a guide. I ended up making a small bust adjustment, narrowing the dart in the waist so that the pattern's center front met mine in the waist and taking a vertical tuck in the back.

Here is what I have so far:

I should probably re-do the tuck in back since it doesn't look like it's straight.

The side seam looks like it's where it should be now. Should I still do the forward shoulder and sway back adjustment? The sway back adjustment should be made on both the bodice and the skirt piece, right?

Thanks so much for all of your help. I really want to get this right. -- Edited on 12/14/10 11:29 AM --

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